LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 - 1A, 0.9V to 10V ... · LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 1 3022fb TYPICAL APPLICATION FEATURES DESCRIPTION 1A, 0.9V to 10V, Very Low

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

13022fb

TYPICAL APPLICATION

FEATURES DESCRIPTION

1A, 0.9V to 10V, Very Low Dropout

Linear Regulator

The LT®3022 is a very low dropout voltage (VLDO™) linear regulator that operates from single input supplies down to 0.9V. The device supplies 1A output current with 145mV typical dropout voltage. The LT3022 is ideal for low input voltage to low output voltage applications, providing comparable electrical efficiency to a switching regulator. The regulator optimizes stability and transient response with low ESR ceramic output capacitors as small as 10µF. Other LT3022 features include 0.05% typical line regulation and 0.05% typical load regulation. In shutdown, quiescent current typically drops to 7.5µA. Internal protection circuitry includes reverse-battery protection, current limiting, ther-mal limiting with hysteresis and reverse-current protection.

The LT3022 is available as an adjustable device with an output voltage range down to the 200mV reference. Three fixed output voltages, 1.2V, 1.5V and 1.8V are also offered. The LT3022 regulator is available in the thermally enhanced low profile (0.75mm) 16-lead (5mm × 3mm) DFN and MSOP packages.

1.2V to 0.9V, 1A VLDO Regulator

APPLICATIONS

n VIN Range: 0.9V to 10Vn Dropout Voltage: 145mV Typicaln Output Current: 1An Adjustable Output (VREF = VOUT(MIN) = 200mV)n Fixed Output Voltages: 1.2V, 1.5V, 1.8Vn Stable with Low ESR, Ceramic Output Capacitors

(10µF Minimum)n 0.05% Typical Load Regulation from 1mA to 1An Quiescent Current: 400µA Typicaln 7.5µA Typical Quiescent Current in Shutdownn Current Limit Protectionn Reverse-Battery Protection with No Reverse Currentn Thermal Limiting with Hysteresisn 16-Lead (5mm × 3mm) DFN and MSOP Packages

n High Efficiency Linear Regulatorsn Battery-Powered Systemsn Logic Suppliesn Post Regulator for Switching Suppliesn Wireless Modemsn FPGA Core Supplies

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. VLDO is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

IN10µF

VIN1.2V

VOUT0.9V1A

LT3022

SHDN

698Ω1%

200Ω1%

OUT

ADJ

GND

10µF

3022 TA01a

Minimum Input Voltage

TEMPERATURE (°C)–50

MIN

IMUM

INPU

T VO

LTAG

E (V

)

0.3

0.9

1.0

1.1

0 50 75

3022 TA01b

0.1

0.7

0.5

0.2

0.8

0

0.6

0.4

–25 25 100 125

IL = 1A

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

23022fb

ABSOLUTE MAXIMUM RATINGSIN Pin Voltage ........................................................ ±10VOUT Pin Voltage ..................................................... ±10VInput-to-Output Differential Voltage ....................... ±10VADJ/SENSE Pin Voltage ......................................... ±10VSHDN Pin Voltage .................................................. ±10VOutput Short-Circuit Duration ......................... Indefinite

(Note 1)

Operating Junction Temperature Range E-, I-Grades (Notes 2, 3) ................... –40°C to 125°C Storage Temperature Range ................. –65°C to 150°CLead Temperature (Soldering, 10 sec) MSOP Package ................................................ 300°C

16

15

14

13

12

11

10

9

17GND

1

2

3

4

5

6

7

8

NC

NC

IN

IN

IN

PGND

PGND

SHDN

NC

NC

OUT

OUT

ADJ

AGND

AGND

NC

TOP VIEW

DHC PACKAGE16-LEAD (5mm × 3mm) PLASTIC DFN

TJMAX = 125°C, qJA = 38°C/W*, qJC = 4°C/W EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB

*SEE THE APPLICATIONS INFORMATION SECTION

12345678

NCNC

OUTOUT

ADJ/SENSE*AGNDAGND

NC

161514131211109

NCNCINININPGNDPGNDSHDN

TOP VIEW

MSE PACKAGE16-LEAD PLASTIC MSOP

17GND

TJMAX = 125°C, qJA = 38°C/W**, qJC = 5°C/W TO 10°C/W

EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB*PIN 5: ADJ FOR LT3022

SENSE FOR LT3022-1.2/LT3022-1.5/LT3022-1.8**SEE THE APPLICATIONS INFORMATION SECTION

PIN CONFIGURATION

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

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ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE

LT3022EDHC#PBF LT3022EDHC#TRPBF 3022 16-Lead (5mm × 3mm) Plastic DFN –40°C to 125°C

LT3022IDHC#PBF LT3022IDHC#TRPBF 3022 16-Lead (5mm × 3mm) Plastic DFN –40°C to 125°C

LT3022EMSE#PBF LT3022EMSE#TRPBF 3022 16-Lead Plastic MSOP –40°C to 125°C

LT3022IMSE#PBF LT3022IMSE#TRPBF 3022 16-Lead Plastic MSOP –40°C to 125°C

LT3022EMSE-1.2#PBF LT3022EMSE-1.2#TRPBF 302212 16-Lead Plastic MSOP –40°C to 125°C

LT3022IMSE-1.2#PBF LT3022IMSE-1.2#TRPBF 302212 16-Lead Plastic MSOP –40°C to 125°C





LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE

LT3022EDHC LT3022EDHC#TR 3022 16-Lead (5mm × 3mm) Plastic DFN –40°C to 125°C

LT3022IDHC LT3022IDHC#TR 3022 16-Lead (5mm × 3mm) Plastic DFN –40°C to 125°C

LT3022EMSE LT3022EMSE#TR 3022 16-Lead Plastic MSOP –40°C to 125°C

LT3022IMSE LT3022IMSE#TR 3022 16-Lead Plastic MSOP –40°C to 125°C

LT3022EMSE-1.2 LT3022EMSE-1.2#TR 302212 16-Lead Plastic MSOP –40°C to 125°C

LT3022IMSE-1.2 LT3022IMSE-1.2#TR 302212 16-Lead Plastic MSOP –40°C to 125°C





Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

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ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Input Voltage (Notes 4, 6) ILOAD = 1A, TA > 0°C ILOAD = 1A, TA ≤ 0°C

0.9 0.9

1.05 1.10

V V

ADJ Pin Voltage (Notes 5, 6) VIN = 1.5V, ILOAD = 1mA 1.15V < VIN < 10V, 1mA < ILOAD < 1A

l

196 194

200 200

204 206

mV mV

Regulated Output Voltage (Note 5) LT3022-1.2 VIN = 1.5V, ILOAD = 1mA 1.5V < VIN < 10V, 1mA < ILOAD <1A

l

1.176 1.164

1.200 1.200

1.224 1.236

V V

LT3022-1.5 VIN = 1.8V, ILOAD = 1mA 1.8V < VIN < 10V, 1mA < ILOAD <1A

l

1.470 1.455

1.500 1.500

1.530 1.545

V V

LT3022-1.8 VIN = 2.1V, ILOAD = 1mA 2.1V < VIN < 10V, 1mA < ILOAD <1A

l

1.764 1.746

1.800 1.800

1.836 1.854

V V

Line Regulation (Note 7) LT3022 ∆VIN = 1.15V to 10V, ILOAD = 1mA LT3022-1.2 ∆VIN = 1.5V to 10V, ILOAD = 1mA LT3022-1.5 ∆VIN = 1.8V to 10V, ILOAD = 1mA LT3022-1.8 ∆VIN = 2.1V to 10V, ILOAD = 1mA

l

l

l

l

–1.5 –9

–11 –13.5

–0.1 0.6 0.8 1

0.5 3.5 4 5

mV mV mV mV

Load Regulation (Note 7) LT3022 VIN = 1.15V, ∆ILOAD = 1mA to 1A

l

–0.5 –1.0

0.1 0.5 1.0

mV mV

LT3022-1.2 VIN = 1.5V, ∆ILOAD = 1mA to 1A

l

–3 –6

0.6 3 6

mV mV


l

–3.8 –7.5

1 3.8 7.5

mV mV


l

–4.5 –9

1.2 4.5 9

mV mV

Dropout Voltage (Notes 8, 9) ILOAD = 10mA

l

45 75 135

mV mV

ILOAD = 100mA

l

55 90 175

mV mV

ILOAD = 500mA

l

110 150 235

mV mV

ILOAD = 1A

l

145 185 285

mV mV

GND Pin Current, VIN = VOUT(NOMINAL) + 0.4V (Notes 9, 10)

ILOAD = 0mA ILOAD = 1mA ILOAD = 100mA ILOAD = 500mA ILOAD = 1A

l

l

l

l

400 1.2 3.4 8.3 18

3.5 8.5 20 36

µA mA mA mA mA

Output Voltage Noise COUT = 10µF, ILOAD = 1A, BW = 10Hz to 100kHz, VOUT = 1.2V

165 µVRMS

ADJ Pin Bias Current (Notes 7, 11) VADJ = 0.2V, VIN = 1.5V 30 100 nA

Shutdown Threshold VOUT = Off to On VOUT = On to Off

l

l

0.25

0.64 0.64

0.9 V V

SHDN Pin Current (Note 12) VSHDN = 0V, VIN = 10V VSHDN = 10V, VIN = 10V

l

l

3

±1 9.5

µA µA

Quiescent Current in Shutdown VIN = 6V, VSHDN = 0V 7.5 15 µA

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

53022fb

Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.Note 2: The LT3022 regulator is tested and specified under pulse load conditions such that TJ ≈ TA. The LT3022 is 100% tested at TA = 25°C. Performance of the LT3022E over the full –40°C and 125°C operating junction temperature range is assured by design, characterization and correlation with statistical process controls. The LT3022I regulators are guaranteed over the full –40°C to 125°C operating junction temperature range. High junction temperatures degrade operating lifetime. Operating lifetime is derated at junction temperatures greater than 125°C.Note 3: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability.Note 4: Minimum input voltage is the voltage required by the LT3022 to regulate the output voltage and supply the rated 1A output current. This specification is tested at VOUT = 0.2V. For higher output voltages, the minimum input voltage required for regulation equals the regulated output voltage VOUT plus the dropout voltage or 1.1V, whichever is greater.Note 5: Maximum junction temperature limits operating conditions. The regulated output voltage specification does not apply for all possible combinations of input voltage and output current. Limit the output current range if operating at maximum input voltage. Limit the input-to-output voltage differential range if operating at maximum output current.Note 6: The LT3022 typically supplies 1A output current with a 0.9V input supply. The guaranteed minimum input voltage for 1A output current is 1.10V, especially if cold temperature operation is required.

Note 7: The LT3022 is tested and specified for these conditions with ADJ tied to OUT. Specifications for fixed output voltage devices are referred to the output voltage.Note 8: Dropout voltage is the minimum input to output voltage differential needed to maintain regulation at a specified output current. In dropout the output voltage equals: (VIN – VDROPOUT).Note 9: The LT3022 is tested and specified for these conditions with an external resistor divider (3.92k and 19.6k) setting VOUT to 1.2V. The external resistor divider adds 50µA of load current.Note 10: GND pin current is tested with VIN = VOUT(NOMINAL) + 0.4V and a current source load. GND pin current increases in dropout. See GND pin current curves in the Typical Performance Characteristics section.Note 11: Adjust pin bias current flows out of the ADJ pin.Note 12: Shutdown pin current flows into the SHDN pin.Note 13: The LT3022 is tested and specified for this condition with an external resistor divider (3.92k and 5.9k) setting VOUT to 0.5V. The external resistor divider adds 50µA of load current. The specification refers to the change in the 0.2V reference voltage, not the 0.5V output voltage. Specifications for fixed output voltage devices are referred to the output voltage.Note 14: Input reverse leakage current flows out of the IN pin.Note 15: Reverse output current is tested with IN grounded and OUT forced to the rated output voltage. This current flows into the OUT pin and out of the GND pin. Note 16: Reverse current is higher for the case of (rated_output) < VOUT < VIN, because the no-load recovery circuitry is active in this region and is trying to restore the output voltage to its nominal value.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Ripple Rejection (Note 13) LT3022 VIN – VOUT = 1V, VRIPPLE = 0.5VP-P , fRIPPLE = 120Hz, ILOAD = 1A

55 70 dB

LT3022-1.2 VIN – VOUT = 1V, VRIPPLE = 0.5VP-P , fRIPPLE = 120Hz, ILOAD = 1A

51 66 dB


51 66 dB


51 66 dB

Current Limit (Note 9) VIN = 10V, VOUT = 0V VIN = VOUT(NOMINAL) + 0.5V, ∆VOUT ≤ –5%

l

1.1

2.6 1.7

A A

Input Reverse Leakage Current (Note 14) VIN = –10V, VOUT = 0V 4 40 µA

Reverse Output Current (Notes 15, 16) LT3022 VOUT = 1.2V, VIN = 0V LT3022-1.2 VOUT = 1.2V, VIN = 0V LT3022-1.5 VOUT = 1.5V, VIN = 0V LT3022-1.8 VOUT = 1.8V, VIN = 0V

0.1 0.1 0.1 0.1

5 5 5 5

µA µA µA µA

Minimum Required Output Current VIN = 1.6V, VOUT = 1.2V l 1 mA

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

63022fb

TYPICAL PERFORMANCE CHARACTERISTICS

Minimum Input Voltage ADJ Pin Voltage

Dropout Voltage Guaranteed Dropout Voltage Dropout Voltage

OUTPUT CURRENT (mA)0

DROP

OUT

VOLT

AGE

(mV)

180

240

300

800

3022 G01

120

60

150

210

270

90

30

0200100 400300 600 700 900500 1000

TJ = 125°C

VOUT = 1.2V

TJ = –40°C

TJ = 25°C

OUTPUT CURRENT (mA)0

GUAR

ANTE

ED D

ROPO

UT V

OLTA

GE (m

V)

180

240

300

800

3022 G02

120

60

150

210

270

90

30

0200100 400300 600 700 900500 1000

TJ = 125°C

TJ = 25°C

= TEST POINTS


0

DROP

OUT

VOLT

AGE

(mV)

30

90

120

150

300

210

0 50 75

3022 G03

60

240

270

180

–25 25 100 125

VOUT = 1.2V

IL = 1A

IL = 500mA

IL = 100mA

IL = 10mA


MIN

IMUM

INPU

T VO

LTAG

E (V

)

0.3

0.9

1.0

1.1

0 50 75

3022 G04

0.1

0.7

0.5

0.2

0.8

0

0.6

0.4

–25 25 100 125

IL = 1A


ADJ

PIN

VOLT

AGE

(mV)

202

204

206

25 75

3022 G05

200

198

–25 0 50 100 125

196

194

IL = 1mA


OUTP

UT V

OLTA

GE (V

)

1.212

1.224

1.236

0 50 75

3022 G05a

1.176

1.188

1.200

1.164–25 25 100 125

IL = 1mA


OUTP

UT V

OLTA

GE (V

)

1.515

1.530

1.545

0 50 75

3022 G05b

1.470

1.485

1.500

1.455–25 25 100 125

IL = 1mA


OUTP

UT V

OLTA

GE (V

)

1.818

1.836

1.854

0 50 75

3022 G05c

1.764

1.782

1.800

1.746–25 25 100 125

IL = 1mA

Output Voltage

Output Voltage Output Voltage

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

73022fb


Quiescent Current Quiescent Current GND Pin Current

GND Pin Current GND Pin Current

ADJ Pin Bias Current Quiescent Current Quiescent Current


0

ADJ

PIN

BIAS

CUR

RENT

(nA)

10

30

40

50

100

70

0 50 75

3022 G06

20

80

90

60

–25 25 100 125TEMPERATURE (°C)

–500

QUIE

SCEN

T CU

RREN

T (µ

A)

100

300

400

500

1000

700

0 50 75

3022 G07

200

800

900

600

–25 25 100 125

VIN = 6VVOUT = 1.2VIL = 0

VSHDN = VIN

VSHDN = 0V

INPUT VOLTAGE (V)0

QUIE

SCEN

T CU

RREN

T (m

A)

3.0

4.0

5.0

8

3022 G08

2.0

1.0

2.5

3.5

4.5

1.5

0.5

021 43 6 7 95 10

VSHDN = VIN

VSHDN = 0V

VOUT = 1.2VIL = 0TJ = 25°C

INPUT VOLTAGE (V)0

QUIE

SCEN

T CU

RREN

T (m

A)

3.0

4.0

5.0

8

3022 G09

2.0

1.0

2.5

3.5

4.5

1.5

0.5

021 43 6 7 95 10

VSHDN = VIN

VSHDN = 0V

VOUT = 1.5VIL = 0TJ = 25°C

INPUT VOLTAGE (V)0

QUIE

SCEN

T CU

RREN

T (m

A)

3.0

4.0

5.0

8

3022 G10

2.0

1.0

2.5

3.5

4.5

1.5

0.5

021 43 6 7 95 10

VSHDN = VIN

VSHDN = 0V

VOUT = 1.8VIL = 0TJ = 25°C

INPUT VOLTAGE (V)0

GND

PIN

CURR

ENT

(mA)

24

21

18

15

12

9

6

3

08

3022 G11

2 4 6 1071 3 5 9

RL = 1.2ΩIL = 1A

RL = 2.4ΩIL = 500mA RL = 120Ω

IL = 10mA

RL = 12ΩIL = 100mA

RL = 1.2kIL = 1mA

VOUT = 1.2VTJ = 25°C

INPUT VOLTAGE (V)0

GND

PIN

CURR

ENT

(mA)

24

21

18

15

12

9

6

3

08

3022 G12

2 4 6 1071 3 5 9

RL = 1.5ΩIL = 1A

RL = 3ΩIL = 500mA RL = 150Ω

IL = 10mA

RL = 15ΩIL = 100mA


RL = 1.5kIL = 1mA

INPUT VOLTAGE (V)0

GND

PIN

CURR

ENT

(mA)

24

21

18

15

12

9

6

3

08

3022 G13

2 4 6 1071 3 5 9

RL = 1.8ΩIL = 1A

RL = 3.6ΩIL = 500mA

RL = 18ΩIL = 100mA


RL = 180ΩIL = 10mA

RL = 1.8kIL = 1mA

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

83022fb


SHDN Pin Input Current Current Limit Reverse Input Leakage Current

Reverse Input Leakage Current Reverse Output Current Input Ripple Rejection

GND Pin Current vs ILOAD SHDN Pin Threshold SHDN Pin Input Current

LOAD CURRENT (mA)0

GND

PIN

CURR

ENT

(mA)

24

21

18

15

12

9

6

3

0800

3022 G14

200 400 600 1000700100 300 500 900

VIN = 1.6VVOUT = 1.2VVSHDN = 10VTJ = 25°C


0

SHDN

PIN

THR

ESHO

LD (V

)

0.1

0.3

0.4

0.5

1.0

0.7

0 50 75

3022 G15

0.2

0.8

0.9

0.6

–25 25 100 125

IL = 1mA

SHDN PIN VOLTAGE (V)0

SHDN

PIN

INPU

T CU

RREN

T (µ

A)

3.0

4.0

5.0

8

3022 G16

2.0

1.0

2.5

3.5

4.5

1.5

0.5

021 43 6 7 95 10

TJ = 25°C


SHDN

PIN

INPU

T CU

RREN

T (µ

A)

4

5

6

25 75

3022 G17

3

2

–25 0 50 100 125

1

0

VIN = 10VVSHDN = 10V


0

CURR

ENT

LIM

IT (A

)

0.3

0.9

1.2

1.5

3.0

2.1

0 50 75

3022 G18

0.6

2.4

2.7

1.8

–25 25 100 125

VOUT = 0V

VIN = 10V

VIN = 1.7V

INPUT VOLTAGE (V)0

INPU

T CU

RREN

T (µ

A)

–8

–4

0

–8

3022 G19

–12

–16

–10

–6

–2

–14

–18

–20–2–1 –4–3 –6 –7 –9–5 –10

VOUT = 0VVSHDN = 10VTJ = 25°C


–20

INPU

T CU

RREN

T (µ

A)

–18

–14

–12

–10

0

–6

0 50 75

3022 G20

–16

–4

–2

–8

–25 25 100 125

VIN = –10VVOUT = 0VVSHDN = 10V


REVE

RSE

OUTP

UT C

URRE

NT (µ

A)

80

100

120

25 75

3022 G21

60

40

–25 0 50 100 125

20

0

VIN = 0VVOUT = 1.2VIOUT FLOWS INTO OUT PINIIN FLOWS OUT OF IN PIN

IOUTIIN

FREQUENCY (Hz)10 100

40

INPU

T RI

PPLE

REJ

ECTI

ON (d

B)

50

60

70

80

1k 10k 100k 1M 10M

3022 G22

30

20

10

0

90

100

COUT = 47µF

COUT = 10µF

VIN = 1.5V + 50mVRMS RIPPLEVOUT = 0.5VIL = 1ATJ = 25°C

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

93022fb


No-Load Recovery Threshold No-Load Recovery Threshold Output Noise Spectral Density

RMS Output Noise vs Load Current (10Hz to 100kHz) Start-Up from Shutdown Transient Response

Input Ripple Rejection Line Regulation Load Regulation


0

INPU

T RI

PPLE

REJ

ECTI

ON (d

B)

10

30

40

50

100

70

0 50 75

3022 G23

20

80

90

60

–25 25 100 125

VIN = 1.5V + 0.5VP-P RIPPLE AT 120HzVOUT = 0.5VCOUT = 10µFIL = 1A


–1.5

LINE

REG

ULAT

ION

(mV)

–1.3

–0.9

–0.7

–0.5

0.5

–0.1

0 50 75

3022 G24

–1.1

0.1

0.3

–0.3

–25 25 100 125

∆VIN = 1.15V TO 10VVOUT = 0.2VIL = 1mA


–1.0

LOAD

REG

ULAT

ION

(mV)

–0.8

–0.4

–0.2

0

1.0

0.4

0 50 75

3022 G25

–0.6

0.6

0.8

0.2

–25 25 100 125

VIN = 1.15VVOUT = 0.5V∆IL = 1mA TO 1ALOAD REGULATION NUMBER REFERS TO CHANGE IN THE 200mV REFERENCE VOLTAGE

OUTPUT OVERSHOOT (%)0

0

OUTP

UT S

INK

CURR

ENT

(mA)

5

10

15

20

25

30TJ = 25°C

5 10 15 20

3022 G26


OUTP

UT O

VERS

HOOT

(%)

8

10

12

25 75

3022 G27

6

4

–25 0 50 100 125

2

0

IOUT(SINK) = 5mA

IOUT(SINK) = 1mA

FREQUENCY (Hz)

0.1OU

TPUT

NOI

SE S

PECT

RAL

DENS

ITY

(µV/

√Hz)

1

10 1k 10k 1M100k

3022 G28

0.001

0.01

100

10VOUT = 1.2VIL = 1ATJ = 25°C

COUT = 47µF

COUT = 10µF

LOAD CURRENT (mA)0.01

80

OUTP

UT N

OISE

(µV R

MS)

100

120

140

160

0.1 1 10 100 1000

3022 G29

60

40

20

0

180

200VOUT = 1.2VCOUT = 10µFTJ = 25°C

VOUT0.5V/DIV

50µs/DIV 3022 G30RL = 1.2ΩVIN = 1.5VVOUT = 1.2VCOUT = 10µF

VSHDN1V/DIV

VOUT50mV/DIV

50µs/DIV 3022 G31VIN = 1.5VVOUT = 1.2VIOUT = 100mA to 1ACOUT = 22µFtRISE = tFALL = 100ns

IOUT500mA/DIV

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

103022fb

PIN FUNCTIONSNC (Pins 1, 2, 8, 15, 16): No Connect Pins. These pins have no connection to internal circuitry. These pins may be floated, tied to VIN or tied to GND for improved thermal performance.

OUT (Pins 3, 4): These pins supply power to the load. Use a minimum output capacitor of 10µF to prevent oscillations. Large load transient applications require larger output capacitors to limit peak voltage transients. See the Applications Information section for more information on output capacitance and reverse-output characteristics. The LT3022 requires a 1mA minimum load current to ensure proper regulation and stability.

SENSE (Pin 5, Fixed Voltage Device Only): This pin is the sense point for the internal resistor divider. It should be tied directly to the OUT pins for best results.

ADJ (Pin 5): This pin is the error amplifier inverting terminal. Its 30nA typical input bias current flows out of the pin (see curve of ADJ Pin Bias Current vs Temperature in the Typical Performance Characteristics). The ADJ pin reference voltage is 200mV (referred to AGND).

AGND (Pins 6, 7): Analog Ground. Tie these pins directly to PGND (Pins 10, 11) and the exposed backside GND (Pin 17). Connect the bottom of the external resistor divider, setting output voltage, directly to AGND for optimum regulation.

SHDN (Pin 9): Pulling the SHDN pin low puts the LT3022 into a low power state and turns the output off. Drive the SHDN pin with either logic or an open-collector/drain device with a pull-up resistor. The resistor supplies the pull-up current to the open collector/drain logic, normally several microamperes, and the SHDN pin current, typically 3µA. If unused, connect the SHDN pin to VIN. The LT3022 does not function if the SHDN pin is not connected.

PGND (Pins 10, 11): Power Ground. The majority of ground pin current flows out of PGND. Tie these pins directly to AGND (Pins 6, 7) and the exposed backside GND (Pin 17).

IN (Pins 12, 13,14): These pins supply power to the device. The LT3022 requires a bypass capacitor at IN if located more than six inches from the main input filter capacitor. Include a bypass capacitor in battery-powered circuits as a battery’s output impedance rises with frequency. A minimum bypass capacitor of 10µF suffices. The LT3022 withstands reverse voltages on the IN pin with respect to ground and the OUT pin. In the case of a reversed input, which occurs if a battery is plugged in backwards, the LT3022 behaves as if a diode is in series with its input. No reverse current flows into the LT3022 and no reverse voltage appears at the load. The device protects itself and the load.

GND (Pin 17): Exposed Pad. Tie this pin directly to AGND (Pins 6, 7), PGND (Pins 10, 11) and the PCB ground. This pin provides enhanced thermal performance with its connection to the PCB ground. See the Applications Information section for thermal considerations and calculating junction temperature.

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

113022fb

BLOCK DIAGRAM

–

+

–

+

9

ERRORAMP

NO-LOADRECOVERY

200mVBIAS CURRENT

ANDREFERENCEGENERATOR

213mV

IDEALDIODE

THERMALSHUTDOWNSHUTDOWN

SHDN

CURRENTGAIN

R3

R2

R1

IN

12, 13, 14

3, 4

D1

Q1

Q3

Q2

D2

25k

PGND

10, 11

OUT

6, 7AGND

3022 BD

ADJ5

5SENSE

FIXEDVOUT

1.2V1.5V1.8V

R1

3.92k3.92k3.92k

R2

19.6k25.5k31.4k

NOTE:FOR LT3022 ADJ PIN (5) IS CONNECTED TO THE ADJ PIN, R1 AND R2 ARE EXTERNAL.FOR LT3022-1.X PIN (5) IS CONNECTED TO THE SENSE PIN, R1 AND R2 ARE INTERNAL.TIE PGND, AGND AND THE EXPOSED PAD TOGETHER.

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

123022fb

APPLICATIONS INFORMATIONThe LT3022 very low dropout linear regulator is capable of 0.9V input supply operation. It supplies 1A output current and dropout voltage is typically 145mV. Quiescent current is typically 400µA and drops to 7.5µA in shutdown. The LT3022 incorporates several protection features, making it ideal for use in battery-powered systems. The device protects itself against reverse-input and reverse-output voltages. If the output is held up by a backup battery when the input is pulled to ground in a battery backup application, the LT3022 behaves as if a diode is in series with its output, preventing reverse current flow. In dual supply applications where the regulator load is returned to a negative supply, pulling the output below ground by as much as 10V does not affect start-up or normal operation.

Adjustable Operation

The LT3022’s output voltage range is 0.2V to 9.5V. Figure 1 shows that the external resistor ratio sets output voltage. The device regulates the output to maintain ADJ at 200mV referred to ground. R1’s current equals 200mV/R1. R2’s current is R1’s current minus the ADJ pin bias current. The 30nA ADJ pin bias current flows out of the pin. Use Figure 1’s formula to calculate output voltage. Given the LT3022’s 1mA minimum load current requirement, Linear Technology recommends choosing resistor divider values to satisfy this requirement. A 200Ω R1 value sets a 1mA resistor divider current. In shutdown, the output is off and the divider current is zero. Curves of ADJ Pin Voltage vs Temperature and ADJ Pin Bias Current vs Temperature appear in the Typical Performance Characteristics section.

Specifications for output voltages greater than 200mV are proportional to the ratio of desired output voltage to 200mV (VOUT/200mV). For example, load regulation for an output current change of 1mA to 1A is typically 100µV at VADJ = 200mV. At VOUT = 1.5V, load regulation is:

1 5200

100 750. •VmV

µV µV=

Table 1 shows 1% resistor divider values for some common output voltages with a resistor divider current equaling or about 1mA.

Table 1VOUT (V) R1 (Ω) R2 (Ω)

0.9 200 698

1.0 187 750

1.2 200 1000

1.5 200 1300

1.8 187 1500

2.5 187 2150

3.3 200 3090

IN

VOUT: 200mV • (1 + R2/R1) – (IADJ • R2)VADJ: 200mVIADJ: 30nA AT 25°COUTPUT RANGE: 0.2V TO 9.5V

VIN

VOUT

LT3022

SHDN

R2

R1

OUT

ADJ

GND

3022 F01

+

Figure 1. Adjustable Operation

Output Capacitance and Transient Response

The LT3022’s design is stable with a wide range of output capacitors, but is optimized for low ESR ceramic capacitors. The output capacitor’s ESR affects stability, most notably with small value capacitors. Use a minimum output capacitor of 10µF with an ESR of less than 0.1Ω to prevent oscillations. The LT3022 is a low voltage device and output load transient response is a function of output capacitance. Larger values of output capacitance decrease the peak deviations and provide improved transient response for large load current changes.

Ceramic capacitors require extra consideration. Manufac-turers make ceramic capacitors with a variety of dielectrics; each with a different behavior across temperature and applied voltage. The most common dielectrics are Z5U, Y5V, X5R and X7R. Z5U and Y5V dielectrics provide high C-V products in a small package at low cost, but exhibit strong voltage and temperature coefficients. X5R and X7R dielectrics yield highly stable characteristics

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

133022fb

APPLICATIONS INFORMATION

DC BIAS VOLTAGE (V)

CHAN

GE IN

VAL

UE (%

)

3022 F02

20

0

–20

–40

–60

–80

–1000 4 8 102 6 12 14

X5R

Y5V

16

BOTH CAPACITORS ARE 16V,1210 CASE SIZE, 10µF


40

20

0

–20

–40

–60

–80

–10025 75

3022 F03

–25 0 50 100 125

Y5V

CHAN

GE IN

VAL

UE (%

) X5R

BOTH CAPACITORS ARE 16V,1210 CASE SIZE, 10µF

Figure 3. Ceramic Capacitor Temperature Characteristics

Figure 2. Ceramic Capacitor DC Bias Characteristics

and are more suitable for use as the output capacitor at fractionally increased cost. X5R and X7R dielectrics both exhibit excellent voltage coefficient characteristics. X7R works over a larger temperature range and exhibits better temperature stability whereas X5R is less expensive and is available in higher values. Figures 2 and 3 show voltage coefficient and temperature coefficient comparisons between Y5V and X5R material.

Voltage and temperature coefficients are not the only sources of problems. Some ceramic capacitors have a piezoelectric response. A piezoelectric device generates voltage across its terminals due to mechanical stress, similar to the way a piezoelectric accelerometer or microphone works. For a ceramic capacitor, the stress can be induced by vibrations in the system or thermal transients. The resulting voltages produced can cause appreciable amounts of noise. A ceramic capacitor produced Figure 4’s trace in response to light tapping from a pencil. Similar vibration induced behavior can masquerade as increased output voltage noise.

1mV/DIV

1ms/DIV 3022 F04VOUT = 1.3VCOUT = 10µFILOAD = 0

Figure 4. Noise Resulting from Tapping on a Ceramic Capacitor

No-Load/Light-Load Recovery

A possible transient load step that occurs is where the output current changes from its maximum level to zero current or a very small load current. The output voltage responds by overshooting until the regulator lowers the amount of current it delivers to the new level. The regulator loop response time and the amount of output capacitance control the amount of overshoot. Once the regulator has decreased its output current, the current provided by the resistor divider (which sets VOUT) is the only current remaining to discharge the output capacitor from the level to which it overshot. The amount of time it takes for the output voltage to recover easily extends to milliseconds with minimum divider current and many microfarads of output capacitance.

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

143022fb

APPLICATIONS INFORMATIONTo eliminate this problem, the LT3022 incorporates a no-load or light load recovery circuit. This circuit is a voltage-controlled current sink that significantly improves the light load transient response time by discharging the output capacitor quickly and then turning off. The current sink turns on when the output voltage exceeds 6.5% of the nominal output voltage. The current sink level is then proportional to the overdrive above the threshold up to a maximum of about 24mA. Consult the curve in the Typical Performance Characteristics for the No-Load Recovery Threshold.

If external circuitry forces the output above the no-load recovery circuit’s threshold, the current sink turns on in an attempt to restore the output voltage to nominal. The current sink remains on until the external circuitry releases the output. However, if the external circuitry pulls the output voltage above the input voltage or the input falls below the output, the LT3022 turns the current sink off and shuts down the bias current/reference generator circuitry.

Thermal Considerations

The LT3022’s maximum rated junction temperature of 125°C limits its power handling capability. Two components comprise the power dissipation of the device:

1. Output current multiplied by the input-to-output voltage differential:

(ILOAD) • (VIN – VOUT) and

2. GND pin current multiplied by the input voltage: (IGND) • (VIN)

GND pin current is found by examining the GND pin current curves in the Typical Performance Characteristics. Power dissipation equals the sum of the two components listed. The LT3022’s internal thermal limiting (with hysteresis) protects the device during overload conditions. For normal continuous conditions, do not exceed the maximum junction temperature rating of 125°C. Carefully consider all sources of thermal resistance from junction to ambient including other heat sources mounted in proximity to the LT3022.

The underside of the LT3022 DHC and MSE packages has exposed metal from the lead frame to the die attachment. Heat transfers directly from the die junction to the printed circuit board metal, allowing maximum junction temperature control. The dual-in-line pin arrangement allows metal to extend beyond the ends of the package on the topside (component side) of a PCB. Connect this metal to GND on the PCB. The multiple IN and OUT pins of the LT3022 also assist in spreading heat to the PCB. Copper board stiffeners and plated throughholes can also be used to spread the heat generated by power devices. The following tables list thermal resistance as a function of copper area in a fixed board size. All measurements are taken in still air on a 4-layer FR-4 board with 1oz solid internal planes, and 2oz external trace planes with a total board thickness of 1.6mm. For more information on thermal resistance and high thermal conductivity test boards, refer to JEDEC standard JESD51, notably JESD51-12 and JESD51-7. Achieving low thermal resistance necessitates attention to detail and careful PCB layout.

Table 2. Measured Thermal Resistance for DHC PackageCOPPER AREA

BOARD AREATHERMAL RESISTANCE

(JUNCTION-TO-AMBIENT)TOPSIDE* BACKSIDE

2500mm2 2500mm2 2500mm2 35°C/W

1000mm2 2500mm2 2500mm2 37°C/W

225mm2 2500mm2 2500mm2 38°C/W

100mm2 2500mm2 2500mm2 40°C/W

*Device is mounted on topside

Table 3. Measured Thermal Resistance for MSE PackageCOPPER AREA

BOARD AREATHERMAL RESISTANCE

(JUNCTION-TO-AMBIENT)TOPSIDE* BACKSIDE

2500mm2 2500mm2 2500mm2 35°C/W

1000mm2 2500mm2 2500mm2 37°C/W

225mm2 2500mm2 2500mm2 38°C/W

100mm2 2500mm2 2500mm2 40°C/W

*Device is mounted on topside.

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

153022fb

APPLICATIONS INFORMATIONCalculating Junction Temperature

Example: Given an output voltage of 1.5V, an input voltage range of 1.7V to 1.9V, an output load current range of 1mA to 1A and a maximum ambient temperature of 85°C, what is the maximum junction temperature for an application using the DHC package?

The power dissipated by the device equals:

ILOAD(MAX) • (VIN(MAX) – VOUT) + IGND • (VIN(MAX))

where:

ILOAD(MAX) = 1A VIN(MAX) = 1.9V IGND at (ILOAD = 1A, VIN = 1.9V) = 18mA

so:

P = 1A • (1.9V – 1.5V) + 18mA • (1.9V) = 0.434W

The thermal resistance is about 38°C/W depending on the copper area. So the junction temperature rise above ambient is approximately equal to:

0.434W • (38°C/W) = 16.5°C

The maximum junction temperature equals the maximum junction temperature rise above ambient plus the maximum ambient temperature or:

TJMAX = 85°C + 16.5°C = 101.5°C

Protection Features

The LT3022 incorporates several protection features that make it ideal for use in battery-powered circuits. In addition to the normal protection features associated with monolithic regulators, such as current limiting and thermal limiting, the device also protects against reverse-input voltages, reverse-output voltages and reverse output-to-input voltages.

Current limit protection and thermal overload protection protect the device against current overload conditions at its output. For normal operation, do not exceed 125°C junction temperature. The typical thermal shutdown temperature is 165°C and the thermal shutdown circuit incorporates about 7°C of hysteresis.

The IN pins withstand reverse voltages of 10V. The LT3022 limits current flow to less than 1µA and no negative voltage appears at OUT . The device protects both itself and the load against batteries that are plugged in backwards.

The LT3022 incurs no damage if OUT is pulled below ground. If IN is left open-circuited or grounded, OUT can be pulled below ground by 10V. No current flows from the pass transistor connected to OUT. However, current flows in (but is limited by) the resistor divider that sets the output voltage. Current flows from the bottom resistor in the divider and from the ADJ pin’s internal clamp through the top resistor in the divider to the external circuitry pulling OUT below ground. If IN is powered by a voltage source, OUT sources current equal to its current limit capability and the LT3022 protects itself by thermal limiting. In this case, grounding SHDN turns off the LT3022 and stops OUT from sourcing current.

The LT3022 incurs no damage if the ADJ pin is pulled above or below ground by 10V. If IN is left open-circuited or grounded and ADJ is pulled above ground, ADJ acts like a 25k resistor in series with two diodes. ADJ acts like a 25k resistor if pulled below ground. If IN is powered by a voltage source and ADJ is pulled below its reference voltage, the LT3022 attempts to source its current limit capability at OUT. The output voltage increases to VIN – VDROPOUT with VDROPOUT set by whatever load current the LT3022 supports. This condition can potentially damage external circuitry powered by the LT3022 if the output voltage increases to an unregulated high voltage. If IN is powered by a voltage source and ADJ is pulled above its reference voltage, two situations can occur. If ADJ is pulled slightly above its reference voltage, the LT3022 turns off the pass transistor, no output current is sourced and the output voltage decreases to either the voltage at ADJ or less. If ADJ is pulled above its no-load recovery threshold, the no-load recovery circuitry turns on and attempts to sink current. OUT is actively pulled low and the output voltage clamps at a Schottky diode above ground. Please note that the behavior described above applies to the LT3022 only. If a resistor divider is connected under the same conditions, there will be additional V/R current.

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

163022fb

APPLICATIONS INFORMATIONIn circuits where a backup battery is required, several different input/output conditions can occur. The output voltage may be held up while the input is either pulled to ground, pulled to some intermediate voltage or is left open circuit. In the case where the input is grounded, there is less than 1µA of reverse output current. If the LT3022 IN pin is forced below the OUT pin or the OUT pin is pulled above the IN pin, input current drops to less than 10µA typically. This occurs if the LT3022 input is connected to a discharged (low voltage) battery and either a backup battery or a second regulator circuit holds up the output. The state of the SHDN pin has no effect on the reverse output current if OUT is pulled above IN.

Input Capacitance and Stability

The LT3022 design is stable with a minimum of 10µF capacitor placed at the IN pin. Very low ESR ceramic capacitors may be used. However, in cases where long wires connect the power supply to the LT3022’s input and ground, use of low value input capacitors combined with an output load current of greater than 20mA may result in instability. The resonant LC tank circuit formed by the wire inductance and the input capacitor is the cause and not a result of LT3022 instability.

The self-inductance, or isolated inductance, of a wire is directly proportional to its length. However, the wire diameter has less influence on its self inductance. For example, the self-inductance of a 2-AWG isolated wire with a diameter of 0.26" is about half the inductance of a 30-AWG wire with a diameter of 0.01". One foot of 30-AWG wire has 465nH of self-inductance.

Several methods exist to reduce a wire’s self-inductance. One method divides the current flowing towards the LT3022 between two parallel conductors. In this case, placing the wires further apart reduces the inductance; up to a 50% reduction when placed only a few inches apart. Splitting the wires connects two equal inductors in parallel. However, when placed in close proximity to each other, mutual inductance adds to the overall self inductance of the wires. The most effective technique to reducing overall inductance is to place the forward and return current conductors (the input wire and the ground wire) in close proximity. Two 30-AWG wires separated by 0.02" reduce the overall self-inductance to about one-fifth of a single wire.

If a battery, mounted in close proximity, powers the LT3022, a 10µF input capacitor suffices for stability. However, if a distantly located supply powers the LT3022, use a larger value input capacitor. Use a rough guideline of 1µF (in addition to the 10µF minimum) per 8 inches of wire length. The minimum input capacitance needed to stabilize the application also varies with power supply output impedance variations. Placing additional capacitance on the LT3022’s output also helps. However, this requires an order of magnitude more capacitance in comparison with additional LT3022 input bypassing. Series resistance between the supply and the LT3022 input also helps stabilize the application; as little as 0.1Ω to 0.5Ω suffices. This impedance dampens the LC tank circuit at the expense of dropout voltage. A better alternative is to use higher ESR tantalum or electrolytic capacitors at the LT3022 input in place of ceramic capacitors.

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

173022fb

PACKAGE DESCRIPTIONDHC Package

16-Lead Plastic DFN (5mm × 3mm)(Reference LTC DWG # 05-08-1706)

3.00 ±0.10(2 SIDES)

5.00 ±0.10(2 SIDES)

NOTE:1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-1) IN JEDEC PACKAGE OUTLINE MO-2292. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE5. EXPOSED PAD SHALL BE SOLDER PLATED6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE

0.40 ± 0.10

BOTTOM VIEW—EXPOSED PAD

1.65 ± 0.10(2 SIDES)

0.75 ±0.05

R = 0.115TYP

R = 0.20TYP

4.40 ±0.10(2 SIDES)

18

169

PIN 1TOP MARK

(SEE NOTE 6)

0.200 REF

0.00 – 0.05

(DHC16) DFN 1103

0.25 ± 0.05

PIN 1NOTCH

0.50 BSC

4.40 ±0.05(2 SIDES)

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

1.65 ±0.05(2 SIDES)2.20 ±0.05

0.50 BSC

0.65 ±0.05

3.50 ±0.05

PACKAGEOUTLINE

0.25 ± 0.05

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

183022fb

PACKAGE DESCRIPTION

MSOP (MSE16) 0911 REV E

0.53 ± 0.152(.021 ± .006)

SEATINGPLANE

0.18(.007)

1.10(.043)MAX

0.17 – 0.27(.007 – .011)

TYP

0.86(.034)REF

0.50(.0197)

BSC

16

16151413121110

1 2 3 4 5 6 7 8

9

9

1 8

NOTE:1. DIMENSIONS IN MILLIMETER/(INCH)2. DRAWING NOT TO SCALE3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX6. EXPOSED PAD DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH ON E-PAD SHALL NOT EXCEED 0.254mm (.010") PER SIDE.

0.254(.010) 0° – 6° TYP

DETAIL “A”

DETAIL “A”

GAUGE PLANE

5.23(.206)MIN

3.20 – 3.45(.126 – .136)

0.889 ± 0.127(.035 ± .005)

RECOMMENDED SOLDER PAD LAYOUT

0.305 ± 0.038(.0120 ± .0015)

TYP

0.50(.0197)

BSC

BOTTOM VIEW OFEXPOSED PAD OPTION

2.845 ± 0.102(.112 ± .004)

2.845 ± 0.102(.112 ± .004)

4.039 ± 0.102(.159 ± .004)

(NOTE 3)

1.651 ± 0.102(.065 ± .004)

1.651 ± 0.102(.065 ± .004)

0.1016 ± 0.0508(.004 ± .002)

3.00 ± 0.102(.118 ± .004)

(NOTE 4)

0.280 ± 0.076(.011 ± .003)

REF

4.90 ± 0.152(.193 ± .006)

DETAIL “B”

DETAIL “B”CORNER TAIL IS PART OF

THE LEADFRAME FEATURE.FOR REFERENCE ONLY

NO MEASUREMENT PURPOSE

0.12 REF

0.35REF

MSE Package16-Lead Plastic MSOP, Exposed Die Pad

(Reference LTC DWG # 05-08-1667 Rev E)

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

193022fb

Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

REVISION HISTORYREV DATE DESCRIPTION PAGE NUMBER

A 9/10 Added -1.2, -1.5, and -1.8 fixed voltage options 1 to 6, 10, 20

B 02/12 Revised Max value for Input Reverse Leakage CurrentUpdated the 16-lead MSE package

518

LT3022/LT3022-1.2LT3022-1.5/LT3022-1.8

203022fb

Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2010

LT 0212 REV B • PRINTED IN USA

RELATED PARTSPART NUMBER DESCRIPTION COMMENTS

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LT3021 500mA, Low Voltage, VLDO Linear Regulator VIN: 0.9V to 10V, Dropout Voltage: 160mV Typical, Adjustable Output (VREF = VOUT(MIN) = 200mV), Fixed Output Voltages: 1.2V, 1.5V, 1.8V, Stable with Low ESR, Ceramic Output Capacitors, 16-Pin DFN (5mm × 5mm) and 8-Lead SO Packages

LTC®3025 300mA Micropower VLDO Linear Regulator VIN = 0.9V to 5.5V, Dropout Voltage: 45mV, Low Noise 80µVRMS, Low IQ: 54µA, 2mm × 2mm 6-Lead DFN Package

LTC3025-1/LTC3025-2/ LTC3025-3/LTC3025-4

500mA Micropower VLDO Linear Regulator in 2mm × 2mm DFN

VIN = 0.9V to 5.5V, Dropout Voltage: 75mV, Low Noise 80µVRMS, Low IQ: 54µA, Fixed Output: 1.2V (LTC3025-2), 1.5V (LTC3025-3), 1.8V (LTC3025-4); Adjustable Output Range: 0.4V to 3.6V (LTC3025-1), 2mm × 2mm 6-Lead DFN Package

LTC3026 1.5A, Low Input Voltage VLDO Linear Regulator VIN: 1.14V to 3.5V (Boost Enabled), 1.14V to 5.5V (with External 5V), VDO = 0.1V, IQ = 950µA, Stable with 10µF Ceramic Capacitors, 10-Lead eMSOP and DFN-10 Packages

LT3029 Dual 500mA/500mA, Low Dropout, Low Noise, Micropower Linear Regulator

Output Current: 500mA per Channel, Low Dropout Voltage: 300mV Low Noise: 20µVRMS (10Hz to 100kHz), Low Quiescent Current: 55µA per Channel, Wide Input Voltage Range: 1.8V to 20V (Common or Independent Input Supply), Adjustable Output: 1.215V Reference, Very Low Quiescent Current in Shutdown: <1µA per Channel Stable with 3.3µF Minimum Output Capacitor, Stable with Ceramic, Tantalum or Aluminum Electrolytic Capacitors, Reverse-Battery, and Reverse Output-to-Input Protection, Thermally Enhanced 16-Lead eMSOP and 16-Lead (4mm × 3mm) DFN Packages

LTC3035 300mA VLDO Linear Regulator with Charge Pump Bias Generator

VIN = 1.7V to 5.5V, VOUT : 0.4V to 3.6V, Dropout Voltage: 45mV, IQ: 100µA, 3mm × 2mm DFN-8

LT3080/LT3080-1 1.1A, Parallelable, Low Noise, Low Dropout Linear Regulator

300mV Dropout Voltage (2-Supply Operation), Low Noise: 40µVRMS, VIN: 1.2V to 36V, VOUT : 0V to 35.7V, Current-Based Reference with 1-Resistor VOUT Set; Directly Parallelable (No Op Amp Required), Stable with Ceramic Capacitors, TO-220, SOT-223, eMSOP-8 and 3mm × 3mm DFN-8 Packages; LT3080-1 Has Integrated Internal Ballast Resistor

LT3085 500mA, Parallelable, Low Noise, Low Dropout Linear Regulator

275mV Dropout Voltage (2-Supply Operation), Low Noise: 40µVRMS, VIN: 1.2V to 36V, VOUT : 0V to 35.7V, Current-Based Reference with 1-Resistor VOUT Set; Directly Parallelable (No Op Amp Required), Stable with Ceramic Capacitors, eMSOP-8 and 2mm × 3mm DFN-6 packages

TYPICAL APPLICATION1.5V to 1.2V, 1A VLDO Regulator

IN10µF

VIN1.5V

VOUT1.2V1A

LT3022-1.2

SHDN

OUT

SENSE

GND

10µF

RLD1.2K*

3022 TA02

*RLD: OPTIONAL (TO SATISFY 1mA MINIMUM LOAD CURRENT REQUIREMENT)

Documents

LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 - 1A, 0.9V to 10V ... · LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 1 3022fb TYPICAL APPLICATION FEATURES DESCRIPTION 1A, 0.9V to 10V, Very Low